ACPI / scan: Introduce acpi_scan_handler_matching()

Introduce new helper routine acpi_scan_handler_matching() for
checking if the given ACPI scan handler matches a given device ID
and rework acpi_scan_match_handler() to use the new routine (that
routine will also be useful for other purposes in the future).
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>
Tested-by: Toshi Kani <toshi.kani@hp.com>

drivers/acpi/scan.c

@@ -1673,12 +1673,10 @@ static int acpi_bus_type_and_status(acpi_handle handle, int *type,
 	return 0;
 }
 
-static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
+static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
+				       char *idstr,
 				       const struct acpi_device_id **matchid)
 {
-	struct acpi_scan_handler *handler;
-
-	list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) {
 	const struct acpi_device_id *devid;
 
 	for (devid = handler->ids; devid->id[0]; devid++)
@@ -1686,9 +1684,21 @@ static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
 			if (matchid)
 				*matchid = devid;
 
-				return handler;
-			}
+			return true;
 		}
+
+	return false;
+}
+
+static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
+					const struct acpi_device_id **matchid)
+{
+	struct acpi_scan_handler *handler;
+
+	list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
+		if (acpi_scan_handler_matching(handler, idstr, matchid))
+			return handler;
+
 	return NULL;
 }